桥梁工程是公路建设碳排放的主要环节,T梁桥作为公路项目标准化制造的重要结构形式,掌握其碳排放特征和规律,有助于公路低碳建设和管理.研究采用排放因子法对23座典型T梁桥进行碳排放测算,划定了公路T梁桥建设边界范围,确定了碳排放测算功能单位,测算了各工程部位的碳排放强度,开展了参数敏感性分析和相关性分析,并提出了基于桥梁长度的桥梁主要结构碳排放估算模型.通过测算结果可知,公路T 梁桥建设碳排放强度为 8 927.13 t CO2e/(km·lane),变化区间为 4 002.64～9 871.74 t CO2e/(km·lane),其中间接碳排放占比为98.28％～99.13％,而直接碳排放为6 820.99 t CO2e.桥梁建设约86％碳排放主要集中在预应力T梁和桩基础,碳排放强度分别为1.23 t CO2e/m3、0.68 t CO2e/m3;约95％来源于水泥、钢材、回旋钻机和交流电弧焊机.敏感性分析表明,当水泥、钢材、电力、化石燃料碳排放因子变化±(10％～30％)时,碳排放变化分别为±(4.77％～14.32％)、±(4.24％～12.74％)、±(0.57％～1.72％)、±(0.14％～0.43％).相关性分析表明,桥梁主要工程部位的碳排放受桥梁规模影响较大,可基于桥梁长度快速估算T梁桥整体和各工程部位的碳排放.对此,项目管理者可通过低碳采购等方式降低间接碳排放;可通过优化加工工艺和施工方案等方式,在工程活动中节约材料、降低能耗;可通过降低用量和碳排放因子多种组合方式,对主要材料和能源进行综合减碳.相关结果可为公路建设项目的低碳管理及相关研究提供详实的数据支持和节能降碳措施建议.
Characteristics and Regular Analysis of Carbon Emission from Highway T-beam Bridges Construction
Bridge engineering is the main component of carbon emission in highway construction,and T-beam bridges is the significant structural form of standardized manufacturing for highway projects.The knowledge of carbon emission characteristics of T-beam bridges will facilitate low-carbon highway construction and management.This study adopted the emission factor method to measure the carbon emission of 23 typical T-beam bridges,defined the boundary scope of the construction of highway T-beam bridges,identified the functional unit of carbon emission measurement,calculated the intensity of carbon emissions from each part of the project,carried out the parameter sensitivity and correlation analyses,and fitted linear regression equations of carbon emission of the main structure of bridges based on the length of the bridges.The calculation results show that the carbon emission intensity of highway T-beam bridge construction is 8 927.13 t CO2e/(km·lane),and the variation interval is 4 002.64～9 871.74 t CO2e/(km·lane),of which the indirect carbon emission accounts for 98.28％～99.13％,while the total amount of direct carbon emission is 6 820.99 t CO2e.Approximately 86％of the carbon emissions from bridge construction are mainly concentrated in prestressed T-beams and pile foundations,with carbon emission intensity of 1.23 t CO2e/m3 and 0.68 t CO2e/m3,respectively;while approximately 95％comes from cement,steel,gyratory drilling rigs,and welding machines.The sensitivity analysis reveals that when the cumulative changes in carbon emission factors of cement,steel,electricity and fossil fuel reach±(10％～30％),the variation in carbon emissions is about±(4.77％～14.32％),±(4.24％～12.74％),±(0.57％～1.72％),and±(0.14％～0.43％),respectively.The correlation analysis shows that the carbon emissions of the main engineering parts are significantly influenced by the scale of the bridge,and the carbon emissions of the whole T-beam bridge and each project part can be quickly estimated based on the bridge length.In this regard,project managers can reduce indirect carbon emissions by means of low-carbon procurement,etc.;they can conserve materials and reduce energy consumption in engineering activities by measures of optimizing processing techniques and construction schemes,etc.;and they can carry out comprehensive carbon reduction of major materials and energy sources by multiple combinations of reduced consumption and carbon emission factors.This research can provide detailed data support and measures of energy-saving and carbon reduction for low-carbon management of highway construction projects and related research.
energy saving and carbon reductioncarbon emissionemission factor methodbridge constructionT-beam bridge
万方数据
维普
